hectic

I own a '02 reg cab long bed Z71 which I ordered new and just turned over 20K miles.The truck has been flawless since day one.The first mod I performed was the K&N cold air package followed by a cat back exhaust with flowmaster.Recently I added a set of Edelbrock ceramic coated shorty headers and the Hypertech programer.When I went to get my yearly inspection the other day the printout came back saying that the O2 sensor heater was not working.I thought that that problem was encountered with the stainless headers that's why I went with the coated ones.I've got the truck on the stock program and the programer does not list any faults or codes.How can this be solved,anyone been down this road before that can share some feedback?